A phosphor containing particle includes a semiconductor nanoparticle phosphor and a matrix including a constitutional unit derived from an ionic liquid, the semiconductor nanoparticle phosphor being dispersed in the matrix. A light emitting device comprises a light source and a wavelength converter in which the phosphor containing particle of the present invention is dispersed in a translucent medium. A phosphor containing sheet in which the phosphor containing particle of the present invention is dispersed in a sheet-like translucent medium.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A light emitting device comprising: a light source; and a wavelength converter in which a phosphor containing particle is dispersed in a translucent medium, wherein the phosphor containing particle includes: a semiconductor nanoparticle phosphor; and a matrix including a constitutional unit derived from an ionic liquid, the semiconductor nanoparticle phosphor is dispersed in the matrix, and the ionic liquid is 2-(methacryloyloxy)-ethyltrimethylammonium bis(trifluoromethanesulfonyl) imide or 1-(3-acryloyloxy-propyl)-3-methy limidazolium bis(trifluoromethane sulfonyl) imide.
2. The light emitting device according to claim 1 , wherein the matrix includes a resin derived from the ionic liquid.
3. The light emitting device according to claim 2 , wherein the ionic liquid has a polymerizable functional group.
4. The light emitting device according to claim 1 , wherein the phosphor containing particle has a size within a range of about 100 nm to about 30 μm.
5. The light emitting device according to claim 1 , wherein the semiconductor nanoparticle phosphor is of a single type.
6. The light emitting device according to claim 1 , further comprising: a red fluorescent light emitting semiconductor nanoparticle phosphor; and a green fluorescent light emitting semiconductor nanoparticle phosphor.
7. The light emitting device according to claim 2 , wherein the resin is crosslinked.
8. The light emitting device according to claim 1 , wherein the phosphor containing particle has an outermost surface including a translucent coating layer.
9. The light emitting device according to claim 8 , wherein a material included in the coating layer is an inorganic material having a band gap equal to or greater than 3.0 eV.
10. The light emitting device according to claim 1 , further comprising a support that seals the matrix.
11. The light emitting device according to claim 10 , wherein the support includes silica.
12. The light emitting device according to claim 10 , wherein the semiconductor nanoparticle phosphor has a surface including a polar functional group.
13. The light emitting device according to claim 10 , wherein the support has a hollow capsular structure including pores penetrating from a wall surface into an internal space.
14. The light emitting device according to claim 10 , wherein the support has a globular structure including pores extending from a surface inwards.
15. The light emitting device according to claim 1 , further comprising: a phosphor containing particle in which a red fluorescent light emitting semiconductor nanoparticle phosphor is dispersed in a resin including a constitutional unit derived from an ionic liquid including a polymerizable functional group; and a phosphor containing particle in which a green fluorescent light emitting semiconductor nanoparticle phosphor is dispersed in a resin including a constitutional unit derived from an ionic liquid including a polymerizable functional group.
16. The light emitting device according to claim 1 , wherein a phosphor other than the semiconductor nanoparticle phosphor is further dispersed in the medium.
17. A light emitting device comprising: a phosphor containing sheet in which a phosphor containing particle is dispersed in a sheet-like translucent medium; and a light source that illuminates the phosphor containing sheet, wherein the phosphor containing particle includes: a semiconductor nanoparticle phosphor; and a matrix including a constitutional unit derived from an ionic liquid, the semiconductor nanoparticle phosphor is dispersed in the matrix, and the ionic liquid is 2-(methacryloyloxy)-ethyltrimethylammonium bis(trifluoromethanesulfonyl) imide or 1-(3-acryloyloxy-propyl)-3-methy limidazolium bis(trifluoromethane sulfonyl) imide.
18. The light emitting device according to claim 17 , wherein the matrix includes a resin derived from the ionic liquid.
19. The light emitting device according to claim 18 , wherein the ionic liquid has a polymerizable functional group.
20. The light emitting device according to claim 17 , wherein the phosphor containing particle has a size within a range of about 100 nm to about 30 μm.
21. The light emitting device according to claim 17 , wherein the semiconductor nanoparticle phosphor is of a single type.
22. The light emitting device according to claim 17 , further comprising: a red fluorescent light emitting semiconductor nanoparticle phosphor; and a green fluorescent light emitting semiconductor nanoparticle phosphor.
23. The light emitting device according to claim 18 , wherein the resin is crosslinked.
24. The light emitting device according to claim 17 , wherein the phosphor containing particle has an outermost surface including a translucent coating layer.
25. The light emitting device according to claim 24 , wherein a material included in the coating layer is an inorganic material having a band gap equal to or greater than 3.0 eV.
26. The light emitting device according to claim 17 , further comprising a support that seals the matrix.
27. The light emitting device according to claim 26 , wherein the support includes silica.
28. The light emitting device according to claim 26 , wherein the semiconductor nanoparticle phosphor has a surface including a polar functional group.
29. The light emitting device according to claim 26 , wherein the support has a hollow capsular structure including pores penetrating from a wall surface into an internal space.
30. The light emitting device according to claim 26 wherein the support has a globular structure including pores extending from a surface inwards.
31. The light emitting device according to claim 17 , further comprising: a phosphor containing particle in which a red fluorescent light emitting semiconductor nanoparticle phosphor is dispersed in a resin including a constitutional unit derived from an ionic liquid including a polymerizable functional group; and a phosphor containing particle in which a green fluorescent light emitting semiconductor nanoparticle phosphor is dispersed in a resin including a constitutional unit derived from an ionic liquid including a polymerizable functional group.
32. The light emitting device according to claim 17 , wherein a phosphor other than the semiconductor nanoparticle phosphor is further dispersed in the medium.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
May 2, 2018
September 3, 2019
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